Calculating machine



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CALCULTING MACHINE FilednMay 2, 1936 v 5 Sheets-Sheet 3 IQM k wmy@ Sun Qin @n @un MJ www m n O M w e r O n SQ .1 K www ,r bh SQ Q 5 m Nmr J wb slniwt Oct. 19, 1937. A. A. ovERBuRY I 2,096,465

CALCULATING MACHINE Filed May 2, 1936 5 Sl'leets-SheecI 4 INVENTOR.

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CALCULTING MACHINE Filed May 2, 1936 5 Sheets-Sheet 5 SIZ/i991. 6

INVENTOR.

` Patented Oct. 159, 1.937 l UNITED STATES 4PATENT oFFrcE Monroe Calculating Machine Company,

LOrange, N. J., a corporation of Delaware v Application May 2, 1936, Serial No. 77,512

3 (Cl. 23S-'63) The invention has relation'to calculating machines equipped with automatic means for shifting the numeral wheel carriage, and more particularly to means for correcting an erroneous operation of such a machine.' The invention is particularly useful in connection with machines YWhereon multiplication is performed by holding down an operation key for a suflicient time to allow themachine to make the desired number of registering cycles, and provides meansffor shifting back the numeral wheel carriage to the position in which the last registration was made, for making a single corrective registration with the carriage in such position and for again ad.- vancing the carriageinto position for the succeeding registration.

The invention consists Vin the novel construction and combination of parts, as set forth in the appended claims.v The invention is shown as applied to a calculating machine of the Monroe type, illustrated in Patent No. 1,773,026, issued to George C. Chase, on August 12', 1930. Certain modifications of the carriage shifting mechanism are in accordance with the disclosure of Patent No. 1,964,478, issued to Austin A. Overbury on June 26, 1934.

In the accompanying drawings, illustrating the invention: y

Fig. 1 is a plan view of a calculating machine embodying the invention.

Fig. 2 is a right side elevation of the same, with the casing removed. i

Fig. 3 is a section taken inside the right hand frame plate of the machine,

Fig. 4 is a left removed. A

Fig. 4a is a detail elevatlonof the stopping pawl etc Fig. 4.

' Fig. 6 is a fragmentary plan view showing the right and left carriage shift mechanism.

` Registering means The calculating machlneis of well known type, wherein values set up on the keys il (Fig. 1) and therebyvon-the diierential actuators 5 (Fig. .3) will be registered one or more times on the numeral wheels I3, upon operation of appropriate 50 motor keys.

These motor keys comprise a plus bar 2|) and a minus bar |2| (Figs. land 2) depression of either one of these bars acting to rock a shaft |25, by means of links |23 and crank arm |24. v 'I'his motion of shaft |25 is transmitted to a setting lever side elevation with the casing s Fig. 5 is a detail elevation of parts shown in |28 (Fig. 3)' through crank arm |26 and coupling pawl |21. Setting lever |28 is provided with opposed shoulders |29 adapted to act upon a pin |30 in one member of a compound clutch lever (Fig. 4) rocking said lever to bring one or the other of two. opposed jaws thereof into clutching engagement with a given element of a differential gear transmission, to drive the actuators 5 in the desired direction. Depression of plus bar |20 will rock the shaft |25 inclockwise direction as viewed in Figs. 2 and 3, rocking the two parts of lever in clockwise direction as viewed in Fig. 4, and bringing the lower jaw of said lever into en-A gagement with the addition clutch element |05 of the dierential transmission, effecting additive rotation of the differential actuators 5 and the, numeral wheels |3. Depression of the vminus bar |2| will rock the parts in an opposite direction, bringing the upper jaw of leveri into engagement with a subtraction clutch member U-of the differential transmission, to effect rotation of the actuators 5 and umeral wheels |3 in the opposite direction. f A Upon release of linger pressure from the bar 20 o'r i 2 I, the differential actuators will complete a cycle of operation and will be brought to rest as follows: Y

Rocking of setting lever |28 by the depression of the plus or minus bar will effect the depression of the rearward arm of an intermediateiy fulcrumed lever |34 (Figs. 3, 4 and 5) by means of a cam surface of the lever |28 acting upon a roller xed upon the lever |34. A pawl |36 is pivotally mounted on the rearward arm` of lever |34, said pgwl in the depression of this rearward arm rom its normal position, illustrated in Fig. 5) moving away from a suitable stop pin and moving pivotally, under the influence of a spring', so that a lug of the pawl is brought beneath the lug -of trigger 3| L Upon release of the key, the rear-- Ward arm of lever |34 will b e raised byfspring means, and pawl |36 will lift trigger 3|, bringing theend of said trigger out of engagement with a spring pawl 25 (Figs. 4 and gia) mounted on a stopping arm24, allowing said pawl to move pivotally into position to engage a shoulder of a reciprocatory lever 22, connected by link 2| and crank arm 20 with the shaft 4 of the tens-transfer mechanism. Crank arm 20, moving through dead center position at the end of a cycle of operation, will rock the lever 22 into contact with the pawl 25, continued rotation of the parts carryiing stop arm -24 forwardly with reciprocatory lever 22, until a lug'of arm 24 encounters a ilxed -stop. At the same time a rearward extension Carriage shifting means Means are provided for automatically shifting the numeral wheel carriage 2 one step toward the right at the end of each calculation by the plus l or minusbar. AFor this purpose a push rod H! (Fig. 4) is `pivoted at one end to the stopping arm 2&3 Iand is held at the other end by a link su and lever sur. when 1ever sur is located in its forward position, as illustrated in Figs. 1 and d, the lower end of push rod 5l@ will be held opposite a pin 5143 fixed in an arm dit of shaft S32. Shaft 682 extends across the front of the machine, and has xed lthereon an arm $85 (Figs.

3 and (i) having a lug underlying the rearward arm of a shift key lever d8?. A depending arm of lever-dol engages a rocker 50i, said rocker being connected at its other end with a rod d8@ vex- 'tending to the rear of the machine, Where it 4 has ,pivotal connect-ion with intermediately ful- Icrumed lever 689 (similar to the lever d@ 'illustrated in Fig. 3); Lever lir forms a stop for a spring clutch device, acting upon removal of the stop to connect a right hand shifting worm lll Awith a. shaft dit, drivenv through gearing ilv from the motor 581 This clutch is similar to the clutch connecting the left hand shifting worm 33513 with shaft M6, which will belater described. The shifting clutch, upon engagement, provides *Y for a single rotation of worm dii, thisy worm acting upon the rack dlg, xed upon the numeral wheel carriage 2, to givev the carriage a single vstep of movement., Upon the completion of this movement the clutch will reengage lever Q89, and

the connection between worm dil and shaft dit;

will be released.

; The key esi may be used for shifting the ca'rriage to the right at any time, or independently ofthe operation of the plus and minus bars, and

a similar key 336 is provided for shiftingthe carrlage to the left by operation ofthe left hand shifting worm dla. The carriage is normally' locked by engagement a shouldered portion of the rod ds.

'loo

'Correction keys Multiplication is commonly performed by holding down the plus bar 'lio .to-give the correct numberof. repeated additions in each ordinal position of the numeral wheel'. carriageI 2, An-

other well knownmethod of performing-multiplicanon isperformed'by holding down the minus bar' iii to give a, number of subtractions equal to 'the complement of the multiplier gure, and

. thereafter multiplying byten, by Single cycle devvo pression of the plus bar in the next higher order.

In both of these methods of operation the lever 542 xmay be set to its forward position, providing l for an automatic shifting of the numeralyvheel carriage 'to the right. f

In case an error has been made, by holding the plus bar or the minus too long, or by `not of a rod ed@ with a mk. Y 5to on the forward edge of the carriage, and thisV lock isremoved upon depression of either key das or 533i, bymeans of a bail 593 underlying .thel key levers, and having a forked lug ,56d engaging holding the bar long enough to eect the proper registration, it has heretofore been necessaryto move the lnumeral wheel carriage 2 one step to the left, and then to depress the plus or minus bar to effect a registration of opposite sign, if the registration has been too great, or'a registra'- tion of like sign if the previous registration has been too small.

According to the present invention the depression of a single key will eect the movement of the carriage to the left, a corrective operation of the machine and the movement of the carriage back to the right, ready for the next operation.

The corrective operation will be additive or subtractive in accordance with the depression of an. additive correction key 555 or of 'subtractive correction key 5l6v (Figs. l and 2). The key levers M5; 5l@ are of bell crank form, the lower arms of each key lever engaging a lug formed in an f intermediately fulcrumed lever dll. The. lower end of lever dll is provided with an extension. 543 engaging a shoulder of link 5MP, which link is pivotally connected with a slide' 52@ (Figs. 3 and 6) supported upon the rod la connecting the left hand shift key Q85 with the clutch lever 590. Depression of either correction key will therefore move rod 338er forwardly and withdraw the upper end of lever itil from restraining engagement with clutch pawl 68H, allowing said pawl tofall into contact with one of a series of clutch teeth upon shaft dlii to effect the clutch, under the influence of a suitable pawl spring. Further movement'of lever 5H by the correction key will bring a beveled end of link die into contact with a fixed member 52 l, camming said link out of engagement with the extension di@ of lever 5W, so that slide 52@ can move back to normal position at the proper time, whether the correction key is still held in depressed position or not. Lever ddd, upon disengagement from clutch pawl ddl 'will be held in retracted position by engagement with a cylindrical surface llaa attached to the worm die, where it will remain until the worm has made nearly a. complete rotation, whereupon a cutaway portion of the cylindrical surface will be brought opposite lever flamand said lever (under the influence of a i suitable spring) will fall back into position to engage the clutch pawlA dei. Pawl ddl being again brought in contact with the end of lever o9@ in the rotation of the parts, the pawl will vbe disengaged from the clutch teeth, completing the left hand shifting operation.

As slide 52B was moved forwardly bythe depression of the correction key a latch 522 will have its beveled end moved away from a xed stop 523, a shoulder ofsaid latch being moved upwardly by spring means into position infront of the laterally bent end of an intermediately fulcrumed Ylever 52d. Slide 52d and-latch 522 are held in forward position so long as lever 596 rests upon vthe periphery of the cylindrical surface of the clutch assembly, but upon movement or lever @gli into position of engagement with the clutch' pawl dei, the rod dtd will -move rearwardly, allowing slide 528 and latch 522 to move with it, the latch thereupon operating to move lever 52d; The opposite arm of lever 525i forms a latch for a spring hammer 525 (Fig. 12) said hammer upon release operating to rock lthe shaft 25 and thereby to set the machine into operation. This is enected by means of a push rod 526, having pivotal connection with the hammer 525, and normally held by spring 527 in position to engage an arm 52d secured upon shaft 25, contact of push rod 528 with said arm serving to rock shaft |25 in a counter-clockwise direction as viewed in Fig. 3, to effect a cycle of subtractive registration. During this cycle, a cam 529 (Fig. 2) will engage a. roller of hammer 525, retracting the hammer and the push rod 525, and engaging the hammer with the latch arm of lever 524. This release of pressure upon arm 528 will give an action similar to the release of nger pressure upon the plus or minus bar,' bringing the machine to a stop and providing for the shifting of the numeral wheel carriage one step to the right.

'I'his is the entire action of the subtractive correction key |5. 'I'he additive correction key 5|5 has a similar action in setting the slide 520, and in addition is provided with means for setting the push rod 525 into position to operate an arm 533 (Fig. 3) of shaft |25, said arm being located on the shaft diametrically opposite to arm 528, so that the movement of the push rod, under the influence of hammer 525, will rock the shaft I 25 in a clockwise direction as viewed in Fig. 3 and will therefore set the machine for a single cycle of additive operation.

It will be observed, therefore, that the position of push rod 525 determines the arithmetical sign of the corrective operation.

'Ihis means comprises a pin 530, xed in the key lever 5| 5 and operable upon depression of the key to depress the forward end of push rod k 525 to bring it out of registry with the contacting portion of the arm 528 and into registry with that of the arm 533. Push rod 525 is held in its adjusted position by means of a spring latch 53| engaging a lug of the push rod to hold it against the-action of spring 521 until it is moved forwardly by the hammer 525, whereupon it will .escape from the latch 53|, which is held by a stop 532, and will return upon the restoration of hammer 525 to its normal position;

I claim:

l. In a, calculating machine having a transversely shiftable carnage and numeral wheels thereon; the combination with means including 'registering devices and carriage shifting devices operable successively to register selected values on said wheels and thereafter to shift said carriage in a given direction; of correction key devices, means operable thereby and cooperating with the carriage shifting devices to shift said carriage reversely of said given direction, and means adapted to effect operation of said registering devices, including a normally restrained spring actuated arm, a trigger, and a trigger operating member adjustable by said key devices and operable by the reverse shifting means to release said arm.

3. In a calculating machine having a transversely shiftable carriage and numeral wheels thereon; the combination with means including registering devices and carriage shifting devices operable successively to register on said wheels selected values of a given arithmetical sign and thereafter to shift said carriage in a given direction; of correction key devices including two keys, means operable thereby and cooperating with the carriage shifting devices to shift said carriage reversely of said given direction, and spring means controlled by the reverse shifting means to effect operation of said registering devices respectively in accordance with or oppositely to said given sign, including a sign determining member adjustable by one of said keys.

AUSTIN A. OVERBURY. 

